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Run-flat tire

A technology for run-flat tires and tires, applied in tire parts, tire sidewalls, transportation and packaging, etc., can solve problems such as uneven rigidity and undesired ride comfort, improve ride comfort, and suppress temperature The effect of raising and improving run-flat durability performance

Inactive Publication Date: 2016-01-27
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the sidewall portion of the above-mentioned run-flat tire has non-uniform rigidity in the tire circumferential direction due to the convex portion, so there is a tendency for generation of periodic vibration components and the like to have undesired ride comfort.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] have figure 1 Run-flat tires with a size of 225 / 55R17 of the basic structure were produced according to the specifications in Table 1, and the run-flat durability and ride comfort performance of each trial tire were tested. In addition, the main common specifications or test methods of each trial tire are as follows.

[0070] Complex elastic modulus E* of sidewall reinforcing rubber layer: 9.0MPa

[0071] Loss tangent tanδ of sidewall reinforced rubber layer: 0.03

[0072] Complex elastic modulus E* of sidewall rubber: 4.0MPa

[0073] Protrusion height H1 of convex part: 2.5mm

[0074] Width W1 of convex part: 2.5mm

[0075] The angular pitches of the protrusions in Comparative Example 2 and Comparative Example 3 are the same.

[0076] The test method is as follows.

[0077]

[0078] Using a cylindrical driving tester, the test tire was driven under the following conditions, and the running distance until the tire made noise was measured. The results are shown ...

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PUM

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Abstract

The invention provides a run-flat tire to improve the run-flat endurance quality and ride comfort property. The run-flat tire (1) is provided with a side-reinforcing rubber layer (10) with an approximately crescent-shaped cross section. On the external surface (3s) of at least either sidewall (3), multiple protrusions (14) raised in a tire axially outward direction are arranged in a tire circumferential direction. In a front view of the sidewall (3), the protrusions (14) each extend to incline relative to a tire radial direction. Protrusions (14, 14) adjacent to each other in a tire circumferential direction are positioned to overlap each other in a tire circumferential direction.

Description

technical field [0001] The present invention relates to a run-flat tire having improved run-flat durability and riding comfort. Background technique [0002] For example, a run-flat tire has been proposed in which a sidewall reinforcing rubber layer having a substantially crescent-shaped cross section is provided on a sidewall portion. During run-flat running, the sidewall reinforcing rubber layer of this run-flat tire is subjected to a large strain and generates heat. As a result of further continued run-flat driving, the sidewall reinforcement rubber layer is damaged due to heat. [0003] In order to increase the run-flat continuation distance, a run-flat tire has been proposed in which a convex portion protruding outward in the tire axial direction and extending in the radial direction of the tire is provided on the outer surface of the sidewall portion. Such convex portions increase the surface area of ​​the sidewall portion. In addition, the convex portion generates ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C17/00B60C13/02
Inventor 森聪一郎
Owner SUMITOMO RUBBER IND LTD
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